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Old 01-08-2013, 10:38 AM   #1769
lancelucas
Scooby Specialist
 
Member#: 124282
Join Date: Aug 2006
Chapter/Region: NWIC
Location: 30000 ft
Vehicle:
04 WRX Wagon PSM
13 STI Sedan SWP

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Quote:
Originally Posted by Equilibrium Tuning View Post
Theoretically you should be able to calculate the needed trim based on IAT by calculating the resulting variance in air density. I always thought IAT should be worked into a true speed density calculation. But in practice it doesn't seem that simple or consistent.

-- Ed
Almost by definition, an SD calculation has to use IAT (charge temp). PV = nRT. Nothing theoretical about it.

Do note, however, that most standalones aren't using a true SD or VE style fueling calculation, which calculates air mass available then fuel mass needed then injector on time. It's a more simple injector on time system, but still requires an air temp. compensation.
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